如何播放Stream<List<int>>格式音频？YouTube视频音频播放报错求助

尝试从YouTube获取视频后，通过自定义StreamAudioSource子类播放音频，编写的代码如下：

class MyCustomSource extends StreamAudioSource { 
  final List<int> bytes; 
  MyCustomSource(this.bytes);

  @override 
  Future<StreamAudioResponse> request([int? start, int? end]) async { 
    start ??= 0; 
    end ??= bytes.length; 
    return StreamAudioResponse(
      sourceLength: bytes.length,
      contentLength: end - start,
      offset: start,
      stream: Stream.value(bytes.sublist(start, end)),
      contentType: 'video/mp4',
    ); 
  } 
}

var get = await videoUrl.first;
var getAsUInt8List = Uint8List.fromList(get);
AudioPlayer player = AudioPlayer();
await player.setAudioSource(MyCustomSource(getAsUInt8List));
player.play();

执行后出现以下错误日志：

E/ExoPlayerImplInternal( 5995): at com.google.android.exoplayer2.extractor.mp4.Mp4Extractor.read(Mp4Extractor.java:254)
E/ExoPlayerImplInternal( 5995): at com.google.android.exoplayer2.source.BundledExtractorsAdapter.read(BundledExtractorsAdapter.java:127)
E/ExoPlayerImplInternal( 5995): at com.google.android.exoplayer2.source.ProgressiveMediaPeriod$ExtractingLoadable.load(ProgressiveMediaPeriod.java:1039)
E/ExoPlayerImplInternal( 5995): at com.google.android.exoplayer2.upstream.Loader$LoadTask.run(Loader.java:412)
E/ExoPlayerImplInternal( 5995): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
E/ExoPlayerImplInternal( 5995): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
E/ExoPlayerImplInternal( 5995): at java.lang.Thread.run(Thread.java:764)
E/AudioPlayer( 5995): TYPE_SOURCE: null
I/ExoPlayerImpl( 5995): Release 2b7745 [ExoPlayerLib/2.18.7] [generic_x86, Android SDK built for x86, Google, 27] [goog.exo.core, goog.exo.exoplayer, goog.exo.decoder, goog.exo.datasource, goog.exo.extractor]
I/flutter ( 5995): err : (0) Source error

尝试过其他音频服务仍无法解决问题，求正确播放Stream<List<int>>格式音频并解决当前报错的方法。

• 修正Content-Type参数
  当前代码将contentType设为video/mp4，但播放的是音频流，需设置对应音频格式的MIME类型，比如AAC用audio/aac，MP3用audio/mpeg。可先通过工具检测字节流的实际编码格式，再配置正确类型。

• 正确处理范围请求边界
  ExoPlayer会发起分段加载的范围请求，需确保request方法处理参数时不越界：

  @override 
  Future<StreamAudioResponse> request([int? start, int? end]) async { 
    final clampedStart = (start ?? 0).clamp(0, bytes.length);
    final clampedEnd = (end ?? bytes.length).clamp(clampedStart, bytes.length);
    
    return StreamAudioResponse(
      sourceLength: bytes.length,
      contentLength: clampedEnd - clampedStart,
      offset: clampedStart,
      stream: Stream.value(Uint8List.fromList(bytes.sublist(clampedStart, clampedEnd))),
      contentType: 'audio/aac', // 替换为实际音频MIME类型
    ); 
  }
  

• 验证字节流完整性与类型
  从YouTube获取的字节流可能包含视频轨道或不完整，可先将字节流保存为本地文件，用媒体播放器测试是否为可播放的纯音频流。如果是带视频的MP4文件，需先分离出音频轨道再传入播放器。

• 简化代码：使用现成的BytesAudioSource
  若自定义StreamAudioSource易出问题，可直接使用audio_player库提供的BytesAudioSource（需确保库版本支持）：

  await player.setAudioSource(BytesAudioSource(getAsUInt8List, contentType: 'audio/aac'));
  

• 添加错误监听获取详细信息
  给播放器添加错误监听，获取更具体的错误原因：

  player.onPlayerError.listen((error) {
    print('错误详情: ${error.message}, 错误码: ${error.code}');
  });
  

内容的提问来源于stack exchange，提问作者smmm